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ERICSSON REVIEW
Vol. 45 1968
RESPONSIBLE PUBLISHER: CHR. JACOB7EUS, DR.TECHN.
EDITOR: SIGVARD EKLUND, DHS
EDITOR'S OFFICE: 126 11 STOCKHOLM 32
SUBSCRIPTIONS: ONE YEAR $ 1:50; ONE COPY $ 0:50
CONTENTS
NETWORK
CONSTRUCTIONS
Corrugated Plastic Conduit Ducts 33
Line Concentrators 163
Some Economic Aspects on the Long-Term Planning of Telephone
Networks. Part I 61
Some Economic Aspects on the Long-Term Planning of Telephone
Networks. Part II 122
The Telephone System of the Finnish State Railways 72
POWER SUPPLY EQUIPMENT
L M Ericsson Power Supply Systems for Telecommunication
Equipments 142
RAILWAY TRAFFIC SIGNALLING
SYSTEMS
Relay Interlocking Plant of the Danish Railways 112
TELEPHONE EXCHANGES AND
SWITCHBOARDS
New Register Arrangement and New Three-Stage Group Selector
for ARF 102 170
Some Economic Aspects on the Long-Term Planning of Telephone
Networks. Part 1 6]
Some Economic Aspects on the Long-Term Planning of Telephone
Networks. Part II 122